KPSA2-40J18 is a module 2 plastic spur gear with 18 teeth and a 6 mm × 2.8 mm keyway, made from MC901 nylon. It has a pitch diameter of 36 mm, an outside diameter of 40 mm, a face width of 20 mm, and a theoretical backlash of 0.091 mm. The gear conforms to JIS grade N9 precision (JIS B1702-1:1998) and has a 20° pressure angle with standard full-depth teeth. Allowable torque and weight are not specified for this exact variant. The gear requires a steel hub for secure shaft attachment due to its plastic construction and is susceptible to dimensional changes from temperature and humidity. Keyway dimensions follow JIS B1301, Js9 tolerance.
Module 2, 40 Tooth Nylon Hubless Spur Gear with 18mm Finished Bore
Our plastic spur gears are available in a variety of materials, including:
With a variety of fastening styles, including:
You May Also Need:
Shafts
Bearings
Couplings
For custom components or modifications to a standard part, call us or submit an RFQ.
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Design of Plastic Gears and General Considerations of Plastic Gearing
How to Achieve Optimum Performance in a Miniature Gear Train
| QTC METRIC GEARS | Stock Drive Products & Sterling Instrument - SDP/SI | |
|---|---|---|
| Product Category | Gears | Gears |
| Product Number | KPSA2-40J18 | KPSA2-40J18 |
| Product Name | Plastic Spur Gears (metric) | Module 2, 40 Tooth Nylon Hubless Spur Gear with 18mm Finished Bore |
| Gear Type | Spur | Spur; Rack |
| Number of Teeth | 40 | 40 |
| Design | Metric | Metric |
| Pressure Angle | 20° | 20° |
| Material | Nylon | Nylon; Nylon / No Insert |
